212145 has 8 divisors (see below), whose sum is σ = 339456. Its totient is φ = 113136.

The previous prime is 212141. The next prime is 212161. The reversal of 212145 is 541212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212145 - 2² = 212141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 14143 = 212145 / (2 + 1 + 2 + 1 + 4 + 5).

It is an alternating number because its digits alternate between even and odd.

212145 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 212145.

It is not an unprimeable number, because it can be changed into a prime (212141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7057 + ... + 7086.

It is an arithmetic number, because the mean of its divisors is an integer number (42432).

2²¹²¹⁴⁵ is an apocalyptic number.

It is an amenable number.

212145 is a deficient number, since it is larger than the sum of its proper divisors (127311).

212145 is a wasteful number, since it uses less digits than its factorization.

212145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14151.

The product of its digits is 80, while the sum is 15.

The square root of 212145 is about 460.5920103519. The cubic root of 212145 is about 59.6409107581.

Adding to 212145 its reverse (541212), we get a palindrome (753357).

The spelling of 212145 in words is "two hundred twelve thousand, one hundred forty-five".